Step Numb. Color Part Description ------------------------------------------------------------------------------- 1 2 Black 3706.DAT Technic Axle 6 1 1 Light-Gray 73071.DAT Technic Differential 1 3 Light-Gray 4143.DAT Technic Gear 14 Tooth Bevel 2 2 Light-Gray 32028.DAT Plate 1 x 2 with Door Rail 2 1 Yellow 3895.DAT Technic Brick 1 x 12 with Holes 3 1 Light-Gray 71427C01.DAT Electric Technic Mini-Motor 9v 3 1 Light-Gray 4265A.DAT Technic Bush 1/2 Type I 4 1 Light-Gray 4019.DAT Technic Gear 16 Tooth 5 2 Light-Gray 32028.DAT Plate 1 x 2 with Door Rail 5 1 Yellow 3895.DAT Technic Brick 1 x 12 with Holes 6 2 Light-Gray 3023.DAT Plate 1 x 2 6 2 Light-Gray 3022.DAT Plate 2 x 2 7 2 Light-Gray 3713.DAT Technic Bush 7 1 Light-Gray 3673.DAT Technic Pin 8 1 Yellow 3894.DAT Technic Brick 1 x 6 with Holes 8 2 Black 6579.DAT Tyre 43.2 x 28 Balloon Small 8 2 Yellow 6580.DAT Wheel 43.2 x 28 Balloon Small 10 1 Black 3706.DAT Technic Axle 6 10 2 Light-Gray 3713.DAT Technic Bush 10 1 Light-Gray 3736.DAT Technic Pulley Large 11 1 Black 5306.DAT Electric Brick 2 x 2 x 2/3 with Wire End 12 1 Black 5306.DAT Electric Brick 2 x 2 x 2/3 with Wire End 12 1 Light-Gray 71427C01.DAT Electric Technic Mini-Motor 9v 12 1 Light-Gray 3647.DAT Technic Gear 8 Tooth 13 4 Light-Gray 3023.DAT Plate 1 x 2 14 1 Black 3705.DAT Technic Axle 4 14 2 Light-Gray 3701.DAT Technic Brick 1 x 4 with Holes 14 1 Light-Gray 3713.DAT Technic Bush 15 1 Light-Gray 3649.DAT Technic Gear 40 Tooth 15 1 Light-Gray 3673.DAT Technic Pin